Answer:
C) human actions altering ecosystems with serious consequences
Explanation:
The increase in the manatee´s death during 2011-2012 might be directly related to human actions.
The increase in the number of people during the last 50 years to more than 500,000 individuals, and probably the lack of policies and regulation, lead to an enhance in water pollution by sewage tank leaks.
Pollution probably caused a gradual decrease in the manatee´s principal source of food, which also caused an increase in the toxic algae population.
Algae caused the death of manatees as a consequence of human action that altered the natural ecosystem by polluting water.
The biggest evidence of natural selection is the progression in the morphology of fossil over time. Some of the fossils are of extinct species. This evidence point to the fact that species evolved from other species, gradually evolving new physical features. This is related to the environment in which they lived in since their morphologies allowed them to be well adapted for their environments.
This is sort of a vague question, but my best guess:
Predator and it's Prey
The earth is aforce to graval
